1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/fs/hfsplus/dir.c 4 * 5 * Copyright (C) 2001 6 * Brad Boyer (flar@allandria.com) 7 * (C) 2003 Ardis Technologies <roman@ardistech.com> 8 * 9 * Handling of directories 10 */ 11 12 #include <linux/errno.h> 13 #include <linux/fs.h> 14 #include <linux/slab.h> 15 #include <linux/random.h> 16 #include <linux/nls.h> 17 18 #include "hfsplus_fs.h" 19 #include "hfsplus_raw.h" 20 #include "xattr.h" 21 #include "acl.h" 22 23 static inline void hfsplus_instantiate(struct dentry *dentry, 24 struct inode *inode, u32 cnid) 25 { 26 dentry->d_fsdata = (void *)(unsigned long)cnid; 27 d_instantiate(dentry, inode); 28 } 29 30 /* Find the entry inside dir named dentry->d_name */ 31 static struct dentry *hfsplus_lookup(struct inode *dir, struct dentry *dentry, 32 unsigned int flags) 33 { 34 struct inode *inode = NULL; 35 struct hfs_find_data fd; 36 struct super_block *sb; 37 hfsplus_cat_entry entry; 38 int err; 39 u32 cnid, linkid = 0; 40 u16 type; 41 42 sb = dir->i_sb; 43 44 dentry->d_fsdata = NULL; 45 err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd); 46 if (err) 47 return ERR_PTR(err); 48 err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, 49 &dentry->d_name); 50 if (unlikely(err < 0)) 51 goto fail; 52 again: 53 err = hfs_brec_read(&fd, &entry, sizeof(entry)); 54 if (err) { 55 if (err == -ENOENT) { 56 hfs_find_exit(&fd); 57 /* No such entry */ 58 inode = NULL; 59 goto out; 60 } 61 goto fail; 62 } 63 type = be16_to_cpu(entry.type); 64 if (type == HFSPLUS_FOLDER) { 65 if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) { 66 err = -EIO; 67 goto fail; 68 } 69 cnid = be32_to_cpu(entry.folder.id); 70 dentry->d_fsdata = (void *)(unsigned long)cnid; 71 } else if (type == HFSPLUS_FILE) { 72 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) { 73 err = -EIO; 74 goto fail; 75 } 76 cnid = be32_to_cpu(entry.file.id); 77 if (entry.file.user_info.fdType == 78 cpu_to_be32(HFSP_HARDLINK_TYPE) && 79 entry.file.user_info.fdCreator == 80 cpu_to_be32(HFSP_HFSPLUS_CREATOR) && 81 (entry.file.create_date == 82 HFSPLUS_I(HFSPLUS_SB(sb)->hidden_dir)-> 83 create_date || 84 entry.file.create_date == 85 HFSPLUS_I(d_inode(sb->s_root))-> 86 create_date) && 87 HFSPLUS_SB(sb)->hidden_dir) { 88 struct qstr str; 89 char name[32]; 90 91 if (dentry->d_fsdata) { 92 /* 93 * We found a link pointing to another link, 94 * so ignore it and treat it as regular file. 95 */ 96 cnid = (unsigned long)dentry->d_fsdata; 97 linkid = 0; 98 } else { 99 dentry->d_fsdata = (void *)(unsigned long)cnid; 100 linkid = 101 be32_to_cpu(entry.file.permissions.dev); 102 str.len = sprintf(name, "iNode%d", linkid); 103 str.name = name; 104 err = hfsplus_cat_build_key(sb, fd.search_key, 105 HFSPLUS_SB(sb)->hidden_dir->i_ino, 106 &str); 107 if (unlikely(err < 0)) 108 goto fail; 109 goto again; 110 } 111 } else if (!dentry->d_fsdata) 112 dentry->d_fsdata = (void *)(unsigned long)cnid; 113 } else { 114 pr_err("invalid catalog entry type in lookup\n"); 115 err = -EIO; 116 goto fail; 117 } 118 hfs_find_exit(&fd); 119 inode = hfsplus_iget(dir->i_sb, cnid); 120 if (IS_ERR(inode)) 121 return ERR_CAST(inode); 122 if (S_ISREG(inode->i_mode)) 123 HFSPLUS_I(inode)->linkid = linkid; 124 out: 125 d_add(dentry, inode); 126 return NULL; 127 fail: 128 hfs_find_exit(&fd); 129 return ERR_PTR(err); 130 } 131 132 static int hfsplus_readdir(struct file *file, struct dir_context *ctx) 133 { 134 struct inode *inode = file_inode(file); 135 struct super_block *sb = inode->i_sb; 136 int len, err; 137 char *strbuf; 138 hfsplus_cat_entry entry; 139 struct hfs_find_data fd; 140 struct hfsplus_readdir_data *rd; 141 u16 type; 142 143 if (file->f_pos >= inode->i_size) 144 return 0; 145 146 err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd); 147 if (err) 148 return err; 149 strbuf = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_MAX_STRLEN + 1, GFP_KERNEL); 150 if (!strbuf) { 151 err = -ENOMEM; 152 goto out; 153 } 154 hfsplus_cat_build_key_with_cnid(sb, fd.search_key, inode->i_ino); 155 err = hfs_brec_find(&fd, hfs_find_rec_by_key); 156 if (err) 157 goto out; 158 159 if (ctx->pos == 0) { 160 /* This is completely artificial... */ 161 if (!dir_emit_dot(file, ctx)) 162 goto out; 163 ctx->pos = 1; 164 } 165 if (ctx->pos == 1) { 166 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) { 167 err = -EIO; 168 goto out; 169 } 170 171 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 172 fd.entrylength); 173 if (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) { 174 pr_err("bad catalog folder thread\n"); 175 err = -EIO; 176 goto out; 177 } 178 if (fd.entrylength < HFSPLUS_MIN_THREAD_SZ) { 179 pr_err("truncated catalog thread\n"); 180 err = -EIO; 181 goto out; 182 } 183 if (!dir_emit(ctx, "..", 2, 184 be32_to_cpu(entry.thread.parentID), DT_DIR)) 185 goto out; 186 ctx->pos = 2; 187 } 188 if (ctx->pos >= inode->i_size) 189 goto out; 190 err = hfs_brec_goto(&fd, ctx->pos - 1); 191 if (err) 192 goto out; 193 for (;;) { 194 if (be32_to_cpu(fd.key->cat.parent) != inode->i_ino) { 195 pr_err("walked past end of dir\n"); 196 err = -EIO; 197 goto out; 198 } 199 200 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) { 201 err = -EIO; 202 goto out; 203 } 204 205 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 206 fd.entrylength); 207 type = be16_to_cpu(entry.type); 208 len = NLS_MAX_CHARSET_SIZE * HFSPLUS_MAX_STRLEN; 209 err = hfsplus_uni2asc(sb, &fd.key->cat.name, strbuf, &len); 210 if (err) 211 goto out; 212 if (type == HFSPLUS_FOLDER) { 213 if (fd.entrylength < 214 sizeof(struct hfsplus_cat_folder)) { 215 pr_err("small dir entry\n"); 216 err = -EIO; 217 goto out; 218 } 219 if (HFSPLUS_SB(sb)->hidden_dir && 220 HFSPLUS_SB(sb)->hidden_dir->i_ino == 221 be32_to_cpu(entry.folder.id)) 222 goto next; 223 if (!dir_emit(ctx, strbuf, len, 224 be32_to_cpu(entry.folder.id), DT_DIR)) 225 break; 226 } else if (type == HFSPLUS_FILE) { 227 u16 mode; 228 unsigned type = DT_UNKNOWN; 229 230 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) { 231 pr_err("small file entry\n"); 232 err = -EIO; 233 goto out; 234 } 235 236 mode = be16_to_cpu(entry.file.permissions.mode); 237 if (S_ISREG(mode)) 238 type = DT_REG; 239 else if (S_ISLNK(mode)) 240 type = DT_LNK; 241 else if (S_ISFIFO(mode)) 242 type = DT_FIFO; 243 else if (S_ISCHR(mode)) 244 type = DT_CHR; 245 else if (S_ISBLK(mode)) 246 type = DT_BLK; 247 else if (S_ISSOCK(mode)) 248 type = DT_SOCK; 249 250 if (!dir_emit(ctx, strbuf, len, 251 be32_to_cpu(entry.file.id), type)) 252 break; 253 } else { 254 pr_err("bad catalog entry type\n"); 255 err = -EIO; 256 goto out; 257 } 258 next: 259 ctx->pos++; 260 if (ctx->pos >= inode->i_size) 261 goto out; 262 err = hfs_brec_goto(&fd, 1); 263 if (err) 264 goto out; 265 } 266 rd = file->private_data; 267 if (!rd) { 268 rd = kmalloc(sizeof(struct hfsplus_readdir_data), GFP_KERNEL); 269 if (!rd) { 270 err = -ENOMEM; 271 goto out; 272 } 273 file->private_data = rd; 274 rd->file = file; 275 spin_lock(&HFSPLUS_I(inode)->open_dir_lock); 276 list_add(&rd->list, &HFSPLUS_I(inode)->open_dir_list); 277 spin_unlock(&HFSPLUS_I(inode)->open_dir_lock); 278 } 279 /* 280 * Can be done after the list insertion; exclusion with 281 * hfsplus_delete_cat() is provided by directory lock. 282 */ 283 memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key)); 284 out: 285 kfree(strbuf); 286 hfs_find_exit(&fd); 287 return err; 288 } 289 290 static int hfsplus_dir_release(struct inode *inode, struct file *file) 291 { 292 struct hfsplus_readdir_data *rd = file->private_data; 293 if (rd) { 294 spin_lock(&HFSPLUS_I(inode)->open_dir_lock); 295 list_del(&rd->list); 296 spin_unlock(&HFSPLUS_I(inode)->open_dir_lock); 297 kfree(rd); 298 } 299 return 0; 300 } 301 302 static int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir, 303 struct dentry *dst_dentry) 304 { 305 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dst_dir->i_sb); 306 struct inode *inode = d_inode(src_dentry); 307 struct inode *src_dir = d_inode(src_dentry->d_parent); 308 struct qstr str; 309 char name[32]; 310 u32 cnid, id; 311 int res; 312 313 if (HFSPLUS_IS_RSRC(inode)) 314 return -EPERM; 315 if (!S_ISREG(inode->i_mode)) 316 return -EPERM; 317 318 mutex_lock(&sbi->vh_mutex); 319 if (inode->i_ino == (u32)(unsigned long)src_dentry->d_fsdata) { 320 for (;;) { 321 get_random_bytes(&id, sizeof(cnid)); 322 id &= 0x3fffffff; 323 str.name = name; 324 str.len = sprintf(name, "iNode%d", id); 325 res = hfsplus_rename_cat(inode->i_ino, 326 src_dir, &src_dentry->d_name, 327 sbi->hidden_dir, &str); 328 if (!res) 329 break; 330 if (res != -EEXIST) 331 goto out; 332 } 333 HFSPLUS_I(inode)->linkid = id; 334 cnid = sbi->next_cnid++; 335 src_dentry->d_fsdata = (void *)(unsigned long)cnid; 336 res = hfsplus_create_cat(cnid, src_dir, 337 &src_dentry->d_name, inode); 338 if (res) 339 /* panic? */ 340 goto out; 341 sbi->file_count++; 342 } 343 cnid = sbi->next_cnid++; 344 res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode); 345 if (res) 346 goto out; 347 348 inc_nlink(inode); 349 hfsplus_instantiate(dst_dentry, inode, cnid); 350 ihold(inode); 351 inode->i_ctime = current_time(inode); 352 mark_inode_dirty(inode); 353 sbi->file_count++; 354 hfsplus_mark_mdb_dirty(dst_dir->i_sb); 355 out: 356 mutex_unlock(&sbi->vh_mutex); 357 return res; 358 } 359 360 static int hfsplus_unlink(struct inode *dir, struct dentry *dentry) 361 { 362 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb); 363 struct inode *inode = d_inode(dentry); 364 struct qstr str; 365 char name[32]; 366 u32 cnid; 367 int res; 368 369 if (HFSPLUS_IS_RSRC(inode)) 370 return -EPERM; 371 372 mutex_lock(&sbi->vh_mutex); 373 cnid = (u32)(unsigned long)dentry->d_fsdata; 374 if (inode->i_ino == cnid && 375 atomic_read(&HFSPLUS_I(inode)->opencnt)) { 376 str.name = name; 377 str.len = sprintf(name, "temp%lu", inode->i_ino); 378 res = hfsplus_rename_cat(inode->i_ino, 379 dir, &dentry->d_name, 380 sbi->hidden_dir, &str); 381 if (!res) { 382 inode->i_flags |= S_DEAD; 383 drop_nlink(inode); 384 } 385 goto out; 386 } 387 res = hfsplus_delete_cat(cnid, dir, &dentry->d_name); 388 if (res) 389 goto out; 390 391 if (inode->i_nlink > 0) 392 drop_nlink(inode); 393 if (inode->i_ino == cnid) 394 clear_nlink(inode); 395 if (!inode->i_nlink) { 396 if (inode->i_ino != cnid) { 397 sbi->file_count--; 398 if (!atomic_read(&HFSPLUS_I(inode)->opencnt)) { 399 res = hfsplus_delete_cat(inode->i_ino, 400 sbi->hidden_dir, 401 NULL); 402 if (!res) 403 hfsplus_delete_inode(inode); 404 } else 405 inode->i_flags |= S_DEAD; 406 } else 407 hfsplus_delete_inode(inode); 408 } else 409 sbi->file_count--; 410 inode->i_ctime = current_time(inode); 411 mark_inode_dirty(inode); 412 out: 413 mutex_unlock(&sbi->vh_mutex); 414 return res; 415 } 416 417 static int hfsplus_rmdir(struct inode *dir, struct dentry *dentry) 418 { 419 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb); 420 struct inode *inode = d_inode(dentry); 421 int res; 422 423 if (inode->i_size != 2) 424 return -ENOTEMPTY; 425 426 mutex_lock(&sbi->vh_mutex); 427 res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name); 428 if (res) 429 goto out; 430 clear_nlink(inode); 431 inode->i_ctime = current_time(inode); 432 hfsplus_delete_inode(inode); 433 mark_inode_dirty(inode); 434 out: 435 mutex_unlock(&sbi->vh_mutex); 436 return res; 437 } 438 439 static int hfsplus_symlink(struct inode *dir, struct dentry *dentry, 440 const char *symname) 441 { 442 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb); 443 struct inode *inode; 444 int res = -ENOMEM; 445 446 mutex_lock(&sbi->vh_mutex); 447 inode = hfsplus_new_inode(dir->i_sb, dir, S_IFLNK | S_IRWXUGO); 448 if (!inode) 449 goto out; 450 451 res = page_symlink(inode, symname, strlen(symname) + 1); 452 if (res) 453 goto out_err; 454 455 res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode); 456 if (res) 457 goto out_err; 458 459 res = hfsplus_init_inode_security(inode, dir, &dentry->d_name); 460 if (res == -EOPNOTSUPP) 461 res = 0; /* Operation is not supported. */ 462 else if (res) { 463 /* Try to delete anyway without error analysis. */ 464 hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name); 465 goto out_err; 466 } 467 468 hfsplus_instantiate(dentry, inode, inode->i_ino); 469 mark_inode_dirty(inode); 470 goto out; 471 472 out_err: 473 clear_nlink(inode); 474 hfsplus_delete_inode(inode); 475 iput(inode); 476 out: 477 mutex_unlock(&sbi->vh_mutex); 478 return res; 479 } 480 481 static int hfsplus_mknod(struct inode *dir, struct dentry *dentry, 482 umode_t mode, dev_t rdev) 483 { 484 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb); 485 struct inode *inode; 486 int res = -ENOMEM; 487 488 mutex_lock(&sbi->vh_mutex); 489 inode = hfsplus_new_inode(dir->i_sb, dir, mode); 490 if (!inode) 491 goto out; 492 493 if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) 494 init_special_inode(inode, mode, rdev); 495 496 res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode); 497 if (res) 498 goto failed_mknod; 499 500 res = hfsplus_init_inode_security(inode, dir, &dentry->d_name); 501 if (res == -EOPNOTSUPP) 502 res = 0; /* Operation is not supported. */ 503 else if (res) { 504 /* Try to delete anyway without error analysis. */ 505 hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name); 506 goto failed_mknod; 507 } 508 509 hfsplus_instantiate(dentry, inode, inode->i_ino); 510 mark_inode_dirty(inode); 511 goto out; 512 513 failed_mknod: 514 clear_nlink(inode); 515 hfsplus_delete_inode(inode); 516 iput(inode); 517 out: 518 mutex_unlock(&sbi->vh_mutex); 519 return res; 520 } 521 522 static int hfsplus_create(struct inode *dir, struct dentry *dentry, umode_t mode, 523 bool excl) 524 { 525 return hfsplus_mknod(dir, dentry, mode, 0); 526 } 527 528 static int hfsplus_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 529 { 530 return hfsplus_mknod(dir, dentry, mode | S_IFDIR, 0); 531 } 532 533 static int hfsplus_rename(struct inode *old_dir, struct dentry *old_dentry, 534 struct inode *new_dir, struct dentry *new_dentry, 535 unsigned int flags) 536 { 537 int res; 538 539 if (flags & ~RENAME_NOREPLACE) 540 return -EINVAL; 541 542 /* Unlink destination if it already exists */ 543 if (d_really_is_positive(new_dentry)) { 544 if (d_is_dir(new_dentry)) 545 res = hfsplus_rmdir(new_dir, new_dentry); 546 else 547 res = hfsplus_unlink(new_dir, new_dentry); 548 if (res) 549 return res; 550 } 551 552 res = hfsplus_rename_cat((u32)(unsigned long)old_dentry->d_fsdata, 553 old_dir, &old_dentry->d_name, 554 new_dir, &new_dentry->d_name); 555 if (!res) 556 new_dentry->d_fsdata = old_dentry->d_fsdata; 557 return res; 558 } 559 560 const struct inode_operations hfsplus_dir_inode_operations = { 561 .lookup = hfsplus_lookup, 562 .create = hfsplus_create, 563 .link = hfsplus_link, 564 .unlink = hfsplus_unlink, 565 .mkdir = hfsplus_mkdir, 566 .rmdir = hfsplus_rmdir, 567 .symlink = hfsplus_symlink, 568 .mknod = hfsplus_mknod, 569 .rename = hfsplus_rename, 570 .listxattr = hfsplus_listxattr, 571 #ifdef CONFIG_HFSPLUS_FS_POSIX_ACL 572 .get_acl = hfsplus_get_posix_acl, 573 .set_acl = hfsplus_set_posix_acl, 574 #endif 575 }; 576 577 const struct file_operations hfsplus_dir_operations = { 578 .fsync = hfsplus_file_fsync, 579 .read = generic_read_dir, 580 .iterate_shared = hfsplus_readdir, 581 .unlocked_ioctl = hfsplus_ioctl, 582 .llseek = generic_file_llseek, 583 .release = hfsplus_dir_release, 584 }; 585